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Changes In Physical and Chemical Properties of Peat In Various Ages of Oil Palm Plant In East Kotawaringin District Rahmawati, Reni; Penyang, Penyang; K. Firdara, Eritha; T, Yusintha; Rosdiana, Rosdiana; E. Putir, Patricia
Devotion : Journal of Research and Community Service Vol. 3 No. 12 (2022): Devotion: Journal of Research and Community Service
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36418/dev.v3i12.234

The purpose of this study was to examine changes in the physical and chemical properties of natural peat forests and peatlands designated for oil palm plantations at various ages of oil palm planting. The research was carried out in 4 (four) locations in East Kotawaringin Regency, namely: (1) Natural peat swamp forest in Kota Besi District (2) Peat land designated for oil palm plantations planting age less than 4 years in Parenggean District; (3) Peat land designated for oil palm plantations with a planting age of 4-10 years in Cempaga District; and (4) peat land designated for oil palm plantations with a planting age of more than 10 years in Mentawa Baru District, Ketapang. The results showed that the peat land designated for oil palm plantations caused changes in the physical and chemical properties of the peat soil. Changes in the physical properties of peat soil are indicated by the color of the peat soil which changes from very dull red in natural peat forests to reddish black in oil palm plantations. Peat maturity changes from fibric in natural peat forest to hemic and sapric on peatland designated for oil palm plantations. The water content has decreased significantly, the older the age of the oil palm plant, the water content will decrease. In terms of bulk density, the older the age of oil palm plantations, the higher the density of peat soils. The water level in oil palm plantations has increased when compared to natural peat forests. Changes in chemical properties were indicated by an increase in peat soil pH, total N, and available P, while a decrease occurred in the C-Organic content. An increase also occurred in the content of K-dd, Ca-dd, Mg-dd, Na-dd, and CEC with increasing age of oil palm plants. When viewed from the relationship pattern of each physical characteristic, water content has a positive relationship with fiber content, the higher the water content will be followed by the higher fiber content or vice versa. Bulk density has a negative relationship with fiber content and moisture content, which means that an increase in the bulk density of peat soil will be followed by a decrease in fiber content and moisture content. The relationship pattern of chemical properties shows that the pH (H2O) of peat soil has a positive relationship with organic C, total N, available P, and Cation Exchange Capacity (CEC). High or low peat acidity will be proportional to the high or low -organic, N-total, P-available, and Cation Exchange Capacity (CEC).

Komposisi Jenis, Serapan Karbon Dioksida dan Produksi Oksigen Vegetasi Berkayu di Hutan Kemasyarakatan Batu Bulan Kabupaten Gunung Mas Kalimantan Tengah: Species Composition, Carbon Dioxide Uptake and Oxygen Production of Woody Vegetation in The Batu Bulan Community Forest Gunung Mas District, Central Kalimantan Junaedi, Ajun; Aruan, Jenifer; Yosep, Yosep; Penyang, Penyang; Surasana, I Nyoman; Rizal, Moh
HUTAN TROPIKA Vol 19 No 1 (2024): Volume 19 Nomor 1 Tahun 2024
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v19i1.13188

Community Forestry is one of the schemes in provides access to forest management legally to the community, so community forestry has a role in supporting the sustainability of forest functions. In line with the principles of sustainable forest management, community forestry management is required to maintain a balance of ecological, economic, and social aspects. The purpose of the study was to identify the species composition and estimate the potential biomass reserves, carbon, carbon dioxide (CO2) absorption, and oxygen (O2) production of woody vegetation in the Batu Bulan Community Forest, Tusang Raya Village, West Rungan District, Gunung Mas Regency, Central Kalimantan Province. Vegetation data collection with vegetation analysis techniques using the plot line method. Data from the analysis of woody vegetation was then calculated for the number of species, Shannon Wienner species diversity index (H'), vegetation density, and Important Value Index (IVI). Calculation of vegetation biomass using destructive and non-destructive methods. While the calculation of carbon, CO2 uptake, and O2 production of woody vegetation were each calculated using SNI 7724 (2019), IPCC (2006), and Nowak et. al (2007). The results showed that the number of woody vegetation species found was 31 species included in 19 families with a Shannon Wienner species diversity index value of 2.81 ("medium" category). Tree and pole-level woody vegetation was dominated by Laban (Vitex pubescens Vahl.), while sapling and seedling levels were dominated by Rubber (Hevea brasiliensis) and Palasit (Canarium sp), respectively. The potential reserves of biomass, carbon, CO2 uptake, and O2 production of woody vegetation were 70.12 tons/ha, 32.81 tonsC/ha, 120.96 tonsCO2/ha, and 88.01 tonsO2/ha, respectively.

Potensi Pertumbuhan Tanaman Jelutung Rawa di Kecamatan Jabiren Raya Kabupaten Pulang Pisau : Potential Growth of Swamp Jelutung Plants in Jabiren Raya District, Pulang Pisau Regency Gaman, Sampang; Rotinsulu, Johanna Maria; Sukarna, Raden Mas; Penyang, Penyang; Nuwa, Nuwa
HUTAN TROPIKA Vol 19 No 1 (2024): Volume 19 Nomor 1 Tahun 2024
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v19i1.14448

The cultivation of swamp jelutong plants on peat swamp land has been widely practiced by communities in Central Kalimantan Province. However, jelutong cultivation efforts are prone to failure due to various factors such as land fires and other factors. The Indonesian government through the Ministry of Forestry in 2003-2005 carried out the Forest and Land Rehabilitation Movement, which involved planting unproductive land in state forest areas and community forests with local species such as jelutong, pulai, balangeran and other species. After almost 20 years of planting Jelutung, information related to the growth and sap potential of Jelutung swamp is not yet available. The purpose of the study was to analyze the potential growth of diameter and height of jelutong plants. This research was conducted for 3 months from October-December 2023. The location of the research was specifically carried out in Jabiren Raya Sub-district (Jelutung plantation of Mr. Margo) and (Jelutung plantation in Jabiren) Pulang Pisau District. The method used to study the dynamics of jelutong plant growth and sap potential was purposive sampling, by selecting and determining jelutong plants based on the age class of jelutong plants with a sampling intensity of ± 5% of the area, the measurement results were analyzed through correlation regression tests in the form of tables and graphs. The results of research conducted in 2 locations show the results of measurements of diameter and height growth of jelutong plants.

Analisis Kerusakan Akibat Hama dan Penyakit pada Tegakan Balangeran (Shorea balangeran (Korth.) Burck) dan Meranti Tembaga (Shorea leprosula Miq) di Kota Palangka Raya : Analysis of Pest and Disease Damage in Balangeran (Shorea balangeran (Korth.) Burck) and Meranti Tembaga (Shorea leprosula Miq) Stands in Palangka Raya City Firdara, Eritha Kristiana; Penyang, Penyang; Sosilawaty, Sosilawaty; Junaedi, Ajun; Hidayat, Ricky Dwi
HUTAN TROPIKA Vol 19 No 2 (2024): Volume 19 Nomor 2 Tahun 2024
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v19i2.18593

This study aims to identify diseases and pests, assess the level of stand damage, and compare the level of damage to Balangeran (Shorea balangeran (Korth.) Burck) and Meranti copper (Shorea leprosula Miq) stands on the Green Campus of Palangka Raya University. Sampling was conducted using purposive sampling method with 5% intensity with a total of 150 stands for balangeran and 135 stands for copper meranti. Sampling in the field used a diagonal pattern by taking five sides of each stand plot. The results showed that the dominant pests attacking balangeran and meranti copper stands were green grasshoppers (Oxya chinensis), termites (Coptotermes curvignathus Holmgren), leaf bugs (Pentatomidae), moth caterpillars (Labeda nobilis), bag caterpillars (Metisa plana), for diseases, namely leaf spot (Coletotrichum sp), leaf spot (Pestaliopsis sp), leaf spot (Phomopsis vexans). The frequency of attack and intensity of pest and disease attack from both planting locations showed that the planting area in the nursery for pests was higher than the seed garden area while for diseases in the seed garden area was lower than the nursery area

Kajian Pertumbuhan Diameter dan Tinggi Pohon Jelutung (Dyera polyphylla (Miq.) di Kota Palangka Raya: Study on Diameter and Height Growth of Jelutung in Palangkaraya Central Kalimantan Gaman, Sampang; Sukarna, Raden Mas; Rotinsulu, Johanna Maria; Penyang, Penyang; Nuwa, Nuwa
HUTAN TROPIKA Vol 20 No 1 (2025): Volume 20 Nomor 1 Tahun 2025
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v20i1.19670

Peat swamp forests are dominated by local tree types that have economic value, such as ramin, merani, nyatoh and jelutung. Jelutung trees provide benefits in the form of wood and sap, in addition, swamp jelutung is an ideal type for the rehabilitation of peat swamp forests that are resistant to flooded peatlands. Based on the above problems, it is necessary to conduct a study to analyze the relationship between the growth of the diameter and height of the jelutung plant. This research was carried out in 2023 in community jelutung gardens in Palangka Raya City. The method used to study the growth dynamics of jelutung trees is carried out by purposive sampling, namely by selecting and determining jelutung trees based on the age class of jelutung trees with a sampling intensity of ±5% of the area or number of trees. The results of measuring the diameter and height of the tree were analyzed through a correlation regression test displayed in the form of tables and graphs. The results of the study at the location of the jelutung plantation in Bukit Tunggal Village showed that the relationship between the diameter and height of the tree in the farmer's garden 1 had a coefficient interval value of 0.9476 and the relationship between the diameter and height of the tree in the farmer's garden 2 showed a coefficient interval value of 0.9563. while the location of the jelutung plantation in Kalampangan Village showed the relationship between the diameter and height of the jelutung tree in the farmer's garden 1 with a coefficient interval value of 0, 9151, the relationship between the diameter and height of the tree in the farmer's garden 2 was 0.8277 and the relationship between the diameter and height of the tree in the farmer's garden 3, farmer 4 and farmer 5 was 0.79551. This value shows that there is a very strong and positive relationship between the two variables.

Intensitas Serangan Hama pada Anakan Tanaman Hutan di Persemaian Permanen Tumbang Nusa Kalimantan Tengah: Intensity of Pest Attacks on Forest Seedlings in The Permanent Nursery of Tumbang Nusa Central Kalimantan Firdara, Eritha Kristiana; Pidjath, Chartina; Yosep, Yosep; Penyang, Penyang; Raskita, Raskita
HUTAN TROPIKA Vol 20 No 1 (2025): Volume 20 Nomor 1 Tahun 2025
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v20i1.20160

This study aims to identify the types, frequency, and intensity of pest attacks on seedlings in the Permanent Nursery, Tumbang Nusa, Central Kalimantan. Nurseries play a vital role in supporting the rehabilitation and conservation of tropical rainforests. Pest attacks on seedlings can reduce plant productivity, cause seedling shortages, and hinder growth, ultimately affecting the success of forest rehabilitation efforts. The research was conducted through field surveys and direct observations to identify the types of pests attacking the seedlings.The results showed that six types of pests (grasshoppers, bagworms, crickets, nettle caterpillars, bush snails, and armyworms) attacked forest seedlings (Shorea balangeran, Alstonia spatulata, Tengkawang, and Shorea leprosula) in the Permanent Nursery managed by the Watershed and Protected Forest Management Center (Balai Pengelolaan Daerah Aliran Sungai dan Hutan Lindung) in Tumbang Nusa. The highest percentage of pest attacks on seedlings in the nursery was observed in Shorea balangeran (grasshoppers, 56%), Shorea leprosula (grasshoppers, 37%), Tengkawang (crickets, 51%), and Alstonia spatulata (grasshoppers, 34%).The intensity of pest attacks on the four seedling types in the nursery ranged from low to high damage categories (6% - 17%). The highest pest attack intensity occurred in Shorea balangeran at 17% (grasshoppers), Shorea leprosula at 11% (crickets), Tengkawang at 16% (crickets), and Alstonia spatulata at 10% (grasshoppers, bush snails, and armyworms). This study highlights the importance of nursery management, including seedling selection, routine fertilization, and weekly insecticide spraying, to minimize pest attacks and maintain seedling quality.

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